Drilling machine



Nov. 3,'1925.

H. A. DOUGLAS DRILLING MACHINE Filed Nav. 1, 1923 2 sheets-sheet 1 Nov. 3., 1925. 1,559,685

.H. A. DOUGLAS DRILLING MACHINE Filed Nov. 1, 1923 2 sheets-sneu 2 f v`#UNITI-2 1) STATES Patenteauev. a, 192s.

PATENT orFlca.

maar A. noUeLAs, or nnoNsoN, MICHIGAN.

. DBIILLING MACHINE.

Application medi-November 1, 1929. Serial' No. 672,114. 'u

To all whom z't, may concgm: v

Be it known that I, HARRY A. DOUGLAS, citizen of the UnitedStates, residin at Bronson, in the county of Branch and tate off Michigan, have invented a certain new and useful Improvement in Drilling chines, of which the following is a full,

clear, concise, and exact description.

My invention relates to drilling machines f for forming holes in objects and transverse to and communicating with other holes present in the objects in a manner to remove lorlprevent burs or other imperfections. at the 'i junctures of the holes. I

The .machine of my invention is of particular utility. in forming holes in bodies of insulation for receiving binding screws that enter circuit terminals disposed in other` The machine of my invention includes a work holding pin formed with a recess on one, side thereof, a support for the pin, and a drill holder serving to position the drill 'in alignmentl with the recess, said drill holder and pin being relatively movable to bring the drill into an'd out of said recess whereb the place of juncture of the hole forme by the drill and the hole in the work that receives the work holding pin may be smooth vand free of imperfections thatotherwise might be due to the.

drilling operation.

In one embodiment of the invention, two

lsubstantially parallel work holding pins are employed, each formed with a recess o'n a.V

side thereof opposite the recessed side of the other, said recesses being adapted to receive the ends of drills that are-passed into and out -of the work upon the pins. These drills are carried upon drill holders, one indil22 of Fig. l; Fig. 3 is a sectional view on linei 3-3 of Fig. 2; Fig.l l i..is asectional View on line 4.-4 of Fig. 3;"Fig, 5 is a sectional View on line Y5---5- of Fig. 3; and Fig. 6 illustrates thev work holder and work in separated. relation.

Like parts are indicatedby similar cliaracters. of reference throughout the different figures.

The machine includesa frame llprovided Y with bearings 2 which carry the -cam shaft 3, this shaft having cams 4 and 5 u onthe ends thereof. Brackets 6 arel carrie by the bearings-2, these bearings being preferably cylindrical upon the exterior to receive the brackets that arecorrespondingly shaped,

each' bracket being formed in twoparts which are clamped upon the corresponding bearing by means of suitable clamping bolts 7-. The brackets carry aligned bearlngs 8 and aligned bearin 8 respectively, in which the drill driving shafts9 are journaled, each shaft having a pulley 10 splined thereon, these pulleys being driven by belts 11, in theembodiment of the invention illus- -trated. The-.bearings 88 may be swung to adjust the alignment of the shafts, the" bolts 7 being coaxial for the purpose. Each shaft 9 carries a drill holder 12', the drills 134 carried by these holders faclng each other. In the embodiment'of the invention shown, the drills are offset and parallel, with bearings 8 and thejbearin s 8 being correspondinly offset. The dri l shafts carry grooved co ars 9 which receive forks 92 that carry the camA rollers 13. These cam rollers en- .ter cam ways 14 upon the cam wheels4, 5.

The forks are reciprocated by the cams upon normally stationary rods 9s which are carried by the bearings 8, 8 for the drill shafts. The reci rocatino' forks cause the cam rollers therein to a vance and withdraw the drill shafts. The shaft 3 carryin the cam wheels is driven by a belt operate pulley 16 whose shaft 17 carries the worm 18 that is in mesh with the worm ear 19 coaxial with the shaft 3. An suitab e tripv for coupling.

ping mechanism is employ the/worm gear 19 with the shafteach time the` shaft is to be turned for the purposeof operating the cams 4, 5,. The` tripping mechanism illustrated includes a pedal operated pin 19 carried by the collar 192 that is fixed upon vshaft 3, movable into and`outV of the recess 193to couple or separate the f gear 19 and shaft' 3.'4 As such tripping The work holder 2O has a stem 21 receivable in a socket 22 formed in the frame eX- tension 23. This socket is placed. with its axis midway between the ends of the drills, set bolt 23 serving to secure the holder within the socket. The holder is formed with fiat sides 24 that are in. sliding engagement with the sides 25 of an upright groove formed in the frame extension 23 whereby the holder is prevented from turning upon the axis of its stem. The holder carries two substantially parallel work holding pins 26, each `formed with a conical recess 27 on a side thereof opposite the recessed side of the other pin. These recesses 27 are adapted to receive the inner ends of the drills 13 at the conclusion of the work:

ing strokes of these drills. The support or holder 20 for the pins also carries drill guides 28 having cylindrical holes there- 4 through which are respectively aligned with terminals, the purpose of the holes 29 being to receive binding screws that pass throughy the circuit terminals into connection with the wires received therein.

Having thus described my linvention I claim as new and desire to secure by Letters Patent the following A work holder including two substantially parallel work holding pins each formed with a recess on a side thereof opposite the recessed side of the other; a support'for said pins; and toolguides, each recess having a guide aligned therewith.

In witness whereof, I hereunto subscribe my name'this 24th day of October A. D.,

HARRY A. DOUGLAS. 

